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1   /*
2    * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.
8    *
9    * This code is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12   * version 2 for more details (a copy is included in the LICENSE file that
13   * accompanied this code).
14   *
15   * You should have received a copy of the GNU General Public License version
16   * 2 along with this work; if not, write to the Free Software Foundation,
17   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18   *
19   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20   * or visit www.oracle.com if you need additional information or have any
21   * questions.
22   *
23   */
24  
25  package sun.jvm.hotspot.interpreter;
26  
27  import java.util.*;
28  import sun.jvm.hotspot.code.*;
29  import sun.jvm.hotspot.debugger.*;
30  import sun.jvm.hotspot.runtime.*;
31  import sun.jvm.hotspot.types.*;
32  
33  public class Interpreter {
34    private static AddressField codeField;
35  
36    static {
37      VM.registerVMInitializedObserver(new Observer() {
38          public void update(Observable o, Object data) {
39            initialize(VM.getVM().getTypeDataBase());
40          }
41        });
42    }
43  
44    private static synchronized void initialize(TypeDataBase db) {
45      Type type = db.lookupType("AbstractInterpreter");
46  
47      codeField     = type.getAddressField("_code");
48    }
49  
50    public Interpreter() {
51    }
52  
53    public StubQueue getCode() {
54      Address code = codeField.getValue();
55      if (code == null) return null;
56      return new StubQueue(code, InterpreterCodelet.class);
57    }
58  
59    public boolean contains(Address pc) {
60      return getCode().contains(pc);
61    }
62  
63    /** Debugging/printing */
64    public InterpreterCodelet getCodeletContaining(Address pc) {
65      return (InterpreterCodelet) getCode().getStubContaining(pc);
66    }
67  }